License Networks

Author

cslovas

Harvester licenses in Maine

To focus on fishery access and harvester adaptability, we’ve removed indigenous licenses and post-harvest (i.e., processors, wholesalers, etc) from the data set.

License Type
aquaculture license: established in 2017
commercial fishing crew
commercial fishing single
commercial pelagic and anadromous crew
commercial pelagic and anadromous single
commercial shellfish
commercial shellfish + 70
commercial shellfish under 18
commercial shrimp crew
commercial shrimp single
eel pot
elver
elver 1 fyke net
elver 1 fyke net crew
elver 2 fyke net
elver 2 fyke net with crew
elver dip net
elver dip net 1 fyke net
elver dip net 1 fyke net crew
elver dip net crew
federal halibut crew
green crab
lobster crab + 70
lobster crab apprentace under 18
lobster crab apprentice
lobster crab apprentice + 70
lobster crab class i
lobster crab class ii
lobster crab class ii + 70
lobster crab class iii
lobster crab class iii + 70
lobster crab non commerical
lobster crab student
lobster crab under 18
marine worm digging
menhaden commercial
menhaden non commercial
mussel boat
mussel dragger
mussel hand
non federal halibut crew
non federal halibut single
quahog (mahogany)
scallop diver
scallop dragger
scallop non commericial
scallop with tender
sea cucumber drag
sea urchin diver
sea urchin dragger
sea urchin raking
sea urchin with tender
seaweed
seaweed supplemental
spat
surf clam boat
vibrio harvester

Time series of license holdings

Annual License Network Metrics

Degree and betweenness are both ways of measuring centrality.

“The degree of a node is the number of other nodes that single node is connected to.

Important nodes tend to have more connections to other nodes. Highly connected nodes are interpreted to have high degree centrality.”

“[Betweenness] ranks the nodes based on the flow of connections through the network. Importance is demonstrated through high frequency of connection with multiple other nodes. Nodes with high levels of betweenness tend to serve as a bridge for multiple sets of other important nodes.” Source

Annual Network Plots

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